Specific Roadgeekery ONLY Seen In 2 Adjacent States

[mrcmc888]

MD and DE share a state highway (54) that forms the border between the two states for a short distance.

Building on that, Arkansas and Oklahoma are the only states where two state routes from different states (OK 20 and AR 43) run concurrent along the state line.

[jp the roadgeek]

Tolls can be found in NY, MA, and RI, but not CT (though it used to be).

Give it time with those in power in CT

By 2022, MA and RI will have mileage based exits on all highways.  NY, CT, VT, and NH will not have them statewide.

NJ and DE have round state route shields while MD has square, PA has the Keystone, and NY has its design,

[thenetwork]

One observation today that I THINK might fit:

Both Utah and Wyoming have some overhead gantry signs that are made out of wood. Both states also have metal overhead BGSs.

[Henry]

NC and VA seem to have an aspect of some small towns where they are built around a railroad track with the street grid. (Ashland, VA and Waxhaw, NC being tow examples of this) Two main streets on both sides of the track and the front of all the buildings faces the tracks. I haven't seen this in many other places. It seems to be very limited to NC.

Speaking of those two states, they have the rounded freeway guide signs, while all the bordering states have squares.

[Hwy 61 Revisited]

NY has a few state routes sandwiched between segments of other state routes, such as Route 440 in Staten Island and Route 426 near Erie.

[hotdogPi]

NY has a few state routes sandwiched between segments of other state routes, such as Route 440 in Staten Island and Route 426 near Erie.

So is MA/RI 114A.

[hbelkins]

West Virginia and Virginia: circle route markers for state secondary roads (despite them being called county roads in WV, they're actually state-maintained.)